baseimage-tutorial-framework/tfw/components/ide/ide_handler.py

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import logging
from tfw.internals.networking import Scope
from tfw.internals.inotify import InotifyObserver
from .file_manager import FileManager
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LOG = logging.getLogger(__name__)
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BUILD_ARTIFACTS = (
"*.a",
"*.class",
"*.dll",
"*.dylib",
"*.elf",
"*.exe",
"*.jar",
"*.ko",
"*.la",
"*.lib",
"*.lo",
"*.o",
"*.obj",
"*.out",
"*.py[cod]",
"*.so",
"*.so.*",
"*.tar.gz",
"*.zip",
"*__pycache__*"
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)
class IdeHandler:
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keys = ['ide']
type_id = 'ControlEventHandler'
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def __init__(self, *, patterns, initial_file=None):
self.connector = None
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self.filemanager = FileManager(patterns)
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self._initial_file = initial_file or ''
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self.monitor = InotifyObserver(
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path=self.filemanager.parents,
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exclude=BUILD_ARTIFACTS
)
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self.monitor.on_modified = self._reload_frontend
self.monitor.start()
self.commands = {
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'ide.read' : self.read,
'ide.write' : self.write
}
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def _reload_frontend(self, event): # pylint: disable=unused-argument
self.send_message({'key': 'ide.reload'})
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@property
def initial_file(self):
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if not self.filemanager.is_allowed(self._initial_file):
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self._initial_file = self.filemanager.files[0]
return self._initial_file
def send_message(self, message):
self.connector.send_message(message, scope=Scope.WEBSOCKET)
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def handle_event(self, message, _):
try:
self.commands[message['key']](message)
message['files'] = self.filemanager.files
self.send_message(message)
except KeyError:
LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
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def read(self, message):
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if 'patterns' in message:
self.filemanager.patterns = message['patterns']
try:
message['filename'] = self.filemanager.find_file(
message.get('filename') or self.initial_file
)
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message['content'] = self.filemanager.read_file(message['filename'])
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except (PermissionError, ValueError):
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message['content'] = 'You have no permission to open that file :('
except FileNotFoundError:
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message['content'] = 'This file does not exist :('
except Exception: # pylint: disable=broad-except
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message['content'] = 'Failed to read file :('
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LOG.exception('Error reading file!')
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def write(self, message):
try:
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self.filemanager.write_file(message['filename'], message['content'])
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except KeyError:
LOG.error('You must provide a filename to write!')
except Exception: # pylint: disable=broad-except
LOG.exception('Error writing file!')
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del message['content']
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def cleanup(self):
self.monitor.stop()